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Documentation Index
Fetch the complete documentation index at: https://docs.polymarket.com/llms.txt Use this file to discover all available pages before exploring further.
Index Price
How the Index Price is computed for Perps
Index Price is Polymarket's estimate of the underlying asset's fair value. It is computed from external price feeds, aggregated to resist stale or anomalous inputs, and published every 200 milliseconds per market.
Feed Sources
Index Price can use feeds from external sources such as:
- Pyth
- Chainlink Data Streams
- Hyperliquid
Feed Selection
The system selects different feeds based on the current market session so it can use the most accurate feed set for each market. See Market Sessions.
Aggregation
Index Price is computed as a weighted average across the selected feeds after dropping stale prices and filtering outliers. This prevents any single stale or anomalous feed from moving the Index.
The same aggregation approach is used to build the C3 candidate in Mark Price, using a separate mark feed set.